12019121 has 4 divisors (see below), whose sum is σ = 12063744. Its totient is φ = 11974500.

The previous prime is 12019099. The next prime is 12019151. The reversal of 12019121 is 12191021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12019121 is a prime.

It is a super-2 number, since 2×12019121² = 288918539225282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12019121.

It is not an unprimeable number, because it can be changed into a prime (12019151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21905 + ... + 22446.

It is an arithmetic number, because the mean of its divisors is an integer number (3015936).

Almost surely, 2^12019121 is an apocalyptic number.

It is an amenable number.

12019121 is a deficient number, since it is larger than the sum of its proper divisors (44623).

12019121 is an equidigital number, since it uses as much as digits as its factorization.

12019121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44622.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 12019121 is about 3466.8603952279. The cubic root of 12019121 is about 229.0643844312.

The spelling of 12019121 in words is "twelve million, nineteen thousand, one hundred twenty-one".